| 1 | Farmers Union Central Exchange, Inc. | | Oil & Gas Operator | May 1983 |
| 2 | FH Petroleum Corp. | Billings, MT 59103 | Oil & Gas Operator | Oct 2025 |
| 3 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Jul 2026 |
| 4 | Filco Incorporated | | Oil & Gas Operator | Jun 2026 |
| 5 | Five States Operating Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Jun 2026 |
| 6 | Flatirons Resources LLC | Westminster, CO 80021 | Oil & Gas Operator | Dec 2022 |
| 7 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 8 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 9 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Sep 2026 |
| 10 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 11 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Sep 2026 |
| 12 | Four Starr Production, LLC | Dallas, TX 75243 | Oil & Gas Operator | Sep 2026 |
| 13 | Fox Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jun 2026 |
| 14 | Fram Operating LLC | | Oil & Gas Operator | Dec 2018 |
| 15 | Fulcrum Energy Operating, LLC | Denver, CO 80206 | Oil & Gas Operator | Jun 2026 |